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  <div class="headertitle"><div class="title">prng.h</div></div>
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<a href="prng_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/*</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * prng.h -- Pseudo Random Numbers</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Copyright (C) 2010-2011 Olaf Bergmann &lt;bergmann@tzi.org&gt;</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> *</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * This file is part of the CoAP library libcoap. Please see README for terms</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of use.</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> */</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span> </div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="preprocessor">#ifndef COAP_PRNG_H_</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="preprocessor">#define COAP_PRNG_H_</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span> </div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="preprocessor">#if defined(WITH_CONTIKI)</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span> </div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><a class="code hl_define" href="libcoap_8h.html#a58b4446dccd0b8c21b3532ef6b77a57d">COAP_STATIC_INLINE</a> <span class="keywordtype">int</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span>contiki_prng_impl(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> len) {</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span>  uint16_t v = random_rand();</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span>  <span class="keywordflow">while</span> (len &gt; <span class="keyword">sizeof</span>(v)) {</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>    memcpy(buf, &amp;v, <span class="keyword">sizeof</span>(v));</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span>    len -= <span class="keyword">sizeof</span>(v);</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span>    buf += <span class="keyword">sizeof</span>(v);</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>    v = random_rand();</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span>  }</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span>  memcpy(buf, &amp;v, len);</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span>}</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span> </div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="preprocessor">#define prng(Buf,Length) contiki_prng_impl((Buf), (Length))</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="preprocessor">#define prng_init(Value) random_init((uint16_t)(Value))</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="preprocessor">#elif defined(WITH_LWIP) &amp;&amp; defined(LWIP_RAND)</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><a class="code hl_define" href="libcoap_8h.html#a58b4446dccd0b8c21b3532ef6b77a57d">COAP_STATIC_INLINE</a> <span class="keywordtype">int</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>lwip_prng_impl(<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> len) {</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>  u32_t v = LWIP_RAND();</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span>  <span class="keywordflow">while</span> (len &gt; <span class="keyword">sizeof</span>(v)) {</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span>    memcpy(buf, &amp;v, <span class="keyword">sizeof</span>(v));</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>    len -= <span class="keyword">sizeof</span>(v);</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>    buf += <span class="keyword">sizeof</span>(v);</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span>    v = LWIP_RAND();</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span>  }</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span> </div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span>  memcpy(buf, &amp;v, len);</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>}</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span> </div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="preprocessor">#define prng(Buf,Length) lwip_prng_impl((Buf), (Length))</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="preprocessor">#define prng_init(Value)</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="preprocessor">#elif defined(_WIN32)</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="preprocessor">#define prng_init(Value)</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span>errno_t __cdecl rand_s( _Out_ <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>* _RandomValue );</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><a class="code hl_define" href="libcoap_8h.html#a58b4446dccd0b8c21b3532ef6b77a57d">COAP_STATIC_INLINE</a> <span class="keywordtype">int</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><a class="code hl_function" href="group__prng.html#gafa5bba40ab5df977fd6dd60ceb5006d7">coap_prng_impl</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> len ) {</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>        <span class="keywordflow">while</span> ( len != 0 ) {</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span>                <a class="code hl_typedef" href="uthash_8h.html#a435d1572bf3f880d55459d9805097f62">uint32_t</a> r = 0;</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>                <span class="keywordtype">size_t</span> i;</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span>                <span class="keywordflow">if</span> ( rand_s( &amp;r ) != 0 )</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span>                        <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span>                <span class="keywordflow">for</span> ( i = 0; i &lt; len &amp;&amp; i &lt; 4; i++ ) {</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>                        *buf++ = (<a class="code hl_typedef" href="uthash_8h.html#aba7bc1797add20fe3efdf37ced1182c5">uint8_t</a>)r;</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span>                        r &gt;&gt;= 8;</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>                }</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span>                len -= i;</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>        }</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>        <span class="keywordflow">return</span> 1;</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>}</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span> </div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="preprocessor">#else</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span> </div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><a class="code hl_define" href="libcoap_8h.html#a58b4446dccd0b8c21b3532ef6b77a57d">COAP_STATIC_INLINE</a> <span class="keywordtype">int</span></div>
<div class="foldopen" id="foldopen00098" data-start="{" data-end="}">
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"><a class="line" href="group__prng.html#gafa5bba40ab5df977fd6dd60ceb5006d7">   98</a></span><a class="code hl_function" href="group__prng.html#gafa5bba40ab5df977fd6dd60ceb5006d7">coap_prng_impl</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> len ) {</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>        <span class="keywordflow">while</span> ( len-- )</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>                *buf++ = rand() &amp; 0xFF;</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span>        <span class="keywordflow">return</span> 1;</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span>}</div>
</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span> </div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span> </div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="preprocessor">#ifndef prng</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"><a class="line" href="group__prng.html#ga7c7d6401e43c811dacb517d51184c873">  112</a></span><span class="preprocessor">#define prng(Buf,Length) coap_prng_impl((Buf), (Length))</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span> </div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span><span class="preprocessor">#ifndef prng_init</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"><a class="line" href="group__prng.html#gaa32e46211968b5a4936d4c122b7fd44c">  122</a></span><span class="preprocessor">#define prng_init(Value) srand((unsigned long)(Value))</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span> </div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="preprocessor">#endif </span><span class="comment">/* COAP_PRNG_H_ */</span><span class="preprocessor"></span></div>
<div class="ttc" id="agroup__prng_html_gafa5bba40ab5df977fd6dd60ceb5006d7"><div class="ttname"><a href="group__prng.html#gafa5bba40ab5df977fd6dd60ceb5006d7">coap_prng_impl</a></div><div class="ttdeci">COAP_STATIC_INLINE int coap_prng_impl(unsigned char *buf, size_t len)</div><div class="ttdoc">Fills buf with len random bytes.</div><div class="ttdef"><b>Definition</b> <a href="prng_8h_source.html#l00098">prng.h:98</a></div></div>
<div class="ttc" id="alibcoap_8h_html_a58b4446dccd0b8c21b3532ef6b77a57d"><div class="ttname"><a href="libcoap_8h.html#a58b4446dccd0b8c21b3532ef6b77a57d">COAP_STATIC_INLINE</a></div><div class="ttdeci">#define COAP_STATIC_INLINE</div><div class="ttdef"><b>Definition</b> <a href="libcoap_8h_source.html#l00038">libcoap.h:38</a></div></div>
<div class="ttc" id="authash_8h_html_a435d1572bf3f880d55459d9805097f62"><div class="ttname"><a href="uthash_8h.html#a435d1572bf3f880d55459d9805097f62">uint32_t</a></div><div class="ttdeci">unsigned int uint32_t</div><div class="ttdef"><b>Definition</b> <a href="uthash_8h_source.html#l00078">uthash.h:78</a></div></div>
<div class="ttc" id="authash_8h_html_aba7bc1797add20fe3efdf37ced1182c5"><div class="ttname"><a href="uthash_8h.html#aba7bc1797add20fe3efdf37ced1182c5">uint8_t</a></div><div class="ttdeci">unsigned char uint8_t</div><div class="ttdef"><b>Definition</b> <a href="uthash_8h_source.html#l00079">uthash.h:79</a></div></div>
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